Boring-machine



1L. G. ZESBAUGH, C. E. LARSON, 0. W. THOMAS AND S. FRYCKBERQ.

BORING MACHINE.

APPLICATION FILED MAY 8. I917.

Patented Nov. 18, 19I9.

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APPLICATION FILED MAY 8, I91]- 1 322,2 1 3. A Patented Nov. 18, 1919.

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L. G. ZESBAUGH, C. E. LARSON, 0. W. THOMAS AND S.,FRYCKBERG.

' BORING MACHINE.

APPLICATION FILED MAYB, I917.

1 322,2 1 3. Patented Nov. 18, 1919.

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LAWRENCE G. ZESBAUGII AND CHARLES E. LARSON, OF MINNEAPOLIS, AND OWEN W.

THOMAS AND SAMUEL FRYCKBERG, OF ST. PAUL, MINNESOTA, ASSIGNOBS 'IO MAR--VEL MACHINERY COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OFMINNESOTA.

. BORING-MACHINE.

Specification of Letters Patent.

Application filed May 8, 1917. Serial No. 167,302.

To all whom it may concern:

Be it known that we, LAWRENCE G. Zns- BAUGH, CHARLES E. LARsoN, OWEN WV.TrIoMAs, and SAMUEL F RYOKBERG, citizens of the United States, residingat Minneapolis (ZESBAUGH and LARSON), and St. Paul (THOMAS and FRYCKBERG), in the counties of Hennepin and Ramsey, respectively, andState of Minnesota, have invented certain new and useful Improvements inBoring- Machines, of which the following is a specification.

Our invention relates to boring machines and has for its object toprovide improved and efii'eient mechanism for operating a boring bar forboring machines. It is an especial object of our invention to providemeans for continuously rotating the boring bar and at the same timeadvancing it at any desired speed from the point where it issubstantially stationary up to the maximum rate of advance. In carryingout our invention we provide improved means, including a friction drivefor controlling both advance and reverse movement of the boring bar atany desired speed.

The full objects and advantages of our invention will appear inconnection with the detailed description thereof and are particularlypointed out in the claim.

In the drawings, illustrating the application of our invention in oneform,-

Figure 1 is a side elevation of a boring machine embodying ourimprovements. Fig. 2 is a top plan view of the same. Fig. 3 is asectional elevation on line 3-3 of Fig. 2.

As illustrated, the machine comprises a base 10 to which is secured atable 11 having thereon, a central (standard 12, rear standard 13 andfront standard 14. A face plate 15 is secured to a plate 16 on standard14, a plate 17 on table 11 and a plate 18 on base member 10. To the faceplate is con-- nected for vertical sliding movement the work-holdingbracket 19 adjusted by hand screw 20 and having thereon the laterallyadjustable table 21 controlled in its lateral adjustments by hand wheel22.

Within the brackets 12 and 14 is journaled a boring bar 26 upon which issplined a spiral gear 27 having the spline extended into a longitudinalgroove 28 in boring bar 26. The spiral gear 27 is held between a portion28 of bracket 12 and a sleeve collei--29 surrounding the boring barbetween spiral gear 27 and bracket 14, as clearly shown in Figs. 1 and2. The end 30 of the boring bar extends through an aperture in faceplate 15, where it is fitted with a boring or milling head 31 which isadapted to operate in a cylinder or other member 32 held upon work table21. A rack bar 33 has its forward end swiveled to the rear end of boringbar 26, being held thereto by an end plate 34. The rack bar extendsrearwardly through a guide 35 above, and meshes with, a pinion 36 on asleeve 37 which is journaled on a transverse shaft 38 mounted in rearbracket 13.

The machine is driven from fast and loose belt pulleys 39 and 40 on atransverse shaft 41 on which is a spiral pinion 42 meshing with thespiral gear 27 on the boring bar 26, and by which said boring bar is1'0- tated. The shaft 41 which is journaled in upright 12 has on one endthe pulleys 39 and 40 and on the other end a friction disk 43.Cotiperating with friction disk 43 is a friction wheel 44 splined upon ashaft 45 which is journaled in brackets 46, 47 and 48 secured to table11. A yoke 49, slidable on a rod 50 carried by brackets 46-and 47 andheld fixed by a set-screw 51, is adapted to hold the friction wheel 44in any desired position on shaft 45, by which, as will be apparent, anydesired speed of rotation of shaft 45 in either direction may be readilyobtained. On shaft 45 is a gear 52 which meshes with a gear 53 on avertical shaft 54 journaled in a side extension 55 of upright 13. Theshaft 54 has thereon a gear 56 which meshes with a gear 57 fast on shaft38, by which means shaft 38 is driven. The sleeve 37 has thereon aclutch member 58 with a hand wheel 59 thereon which cooperates with aclutch member 60 splined on shaft 38 and controlled by a shifter lever61 which is held in either operative or inoperative position by means ofa latch bar 62.

From the foregoing the operation of our device will be apparent. Bythrowing clutch 60 out sleeve 37 may be operated by hand Wheel 59independently of the power drive to project or retract the boring bar.When clutch 60 is thrown in, the sleeve 37 will be driven from shaft 38by the friction disk 43 and train of worm gearing above described,whereby the rack bar 33 will advance the boring bar at any desired rateof speed or retract it at any desired rate of speed. The entire drive ofthe device is in the highest degree simple and efficient. The essentialelement of a graduated and uniform advance of the boring or milling toolproportioned to the character of the Work being done, is accomplishedwith absolute certainty. All of the parts are readily accessible and themachine is compact and operates With a minimum requirement of power. Aspiral driving pinion i2 is located in the vertical plane of the axis ofthe boring bar and cooperates With the spiral gear-27 splined on theboringbar to rotate the boring bar at the required speed, and it doesthis With such constant application of power that the rotation of thebar is Without vibration or chattering conducing to perfect Work of theboring bar.

lVe claim:

A boring machine comprising a slidable and rotatable boring bar, a rackbar svviveled to the boring bar for sliding the same, a transversedriven shaft, a spiral pinion secured to said shaft, a spiral gearsplined on said boring bar, a friction disk on the end of said drivenshaft, a longitudinal shaft, a friction Wheel slidably and nonrotatablymounted on said longitudinal shaft for adjustable engagement with saidfriction disk, a gear secured to the rear end of said longitudinalshaft, a vertical shaft, a gear on said vertical shaft meshing with saidlast mentioned gear, a transverse shaft mounted at the rear of themachine, a gear on said transverse shaft meshing with the gear on thevertical shaft, a sleeve journaled on said transverse shaft, a pinion onsaid sleeve meshing with said rack bar, a clutch member on said sleeve,a clutch member splined on said transverse shaft, and means for movingthe clutching members into clutching and unclutching position.

In testimony whereof we affix our signatures.

LAWRENCE G. ZESBAUGH. CHARLES E. LARSON. OWEN W. THOMAS. SAMUELFRYCKBERG.

